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## org.bouncycastle.asn1.x509
Class AltSignatureAlgorithm

    java.lang.Object
      org.bouncycastle.asn1.ASN1Object
          org.bouncycastle.asn1.x509.AltSignatureAlgorithm

All Implemented Interfaces:
  ASN1Encodable, Encodable

public class AltSignatureAlgorithm
extends ASN1Object

X.509 Section 9.8.3.
This extension may be used as a public-key certificate extension, a CRL extension or an AVL extension. It shall contain the algorithm identifier for the alternative digital signature algorithm used by the signer when creating an alternative digital signature and by the relying party when validating the alternative digital signature. altSignatureAlgorithm EXTENSION ::= { SYNTAX AltSignatureAlgorithm IDENTIFIED BY id-ce-altSignatureAlgorithm } AltSignatureAlgorithm ::= AlgorithmIdentifier{{SupportedAlgorithms}} When the altSignatureAlgorithm extension is included in a particular value that is an instance of a data type that supports extensions, the altSignatureValue extension shall also be included.
NOTE 1 – By having a separate altSignatureAlgorithm extension, instead of having it combined with the altSignatureValue extension, the alternative digital signature algorithm is protected by the alternative signature. This extension may be flagged either as critical or as non-critical.
NOTE 2 – It is recommended that it be flagged as non-critical. Flagging it as critical would require all relying parties to understand the extension and the alternative public-key algorithms

Constructor Summary
`AltSignatureAlgorithm(AlgorithmIdentifier algorithm)`
`AltSignatureAlgorithm(ASN1ObjectIdentifier algorithm)`
`AltSignatureAlgorithm(ASN1ObjectIdentifier algorithm, ASN1Encodable parameters)`

Method Summary
`static AltSignatureAlgorithm` | `fromExtensions(Extensions extensions)`
`AlgorithmIdentifier` | `getAlgorithm()` Return the algorithm identifier representing the alternate signature algorithm used to generate the alternate signature algorithm value extension.
`static AltSignatureAlgorithm` | `getInstance(ASN1TaggedObject obj, boolean explicit)`
`static AltSignatureAlgorithm` | `getInstance(java.lang.Object obj)`
`ASN1Primitive` | `toASN1Primitive()` Method providing a primitive representation of this object suitable for encoding.

Methods inherited from class org.bouncycastle.asn1.ASN1Object
`encodeTo, encodeTo, equals, getEncoded, getEncoded, hasEncodedTagValue, hashCode`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### AltSignatureAlgorithm

    public AltSignatureAlgorithm(AlgorithmIdentifier algorithm)

### AltSignatureAlgorithm

    public AltSignatureAlgorithm(ASN1ObjectIdentifier algorithm)

### AltSignatureAlgorithm

    public AltSignatureAlgorithm(ASN1ObjectIdentifier algorithm,
                                 ASN1Encodable parameters)

Method Detail

### getInstance

    public static AltSignatureAlgorithm getInstance(ASN1TaggedObject obj,
                                                    boolean explicit)

### getInstance

    public static AltSignatureAlgorithm getInstance(java.lang.Object obj)

### fromExtensions

    public static AltSignatureAlgorithm fromExtensions(Extensions extensions)

### getAlgorithm

    public AlgorithmIdentifier getAlgorithm()

  Return the algorithm identifier representing the alternate signature algorithm used to generate the alternate signature algorithm value extension.

  Returns:
    alternate signature algorithm identifier.

### toASN1Primitive

    public ASN1Primitive toASN1Primitive()

  Description copied from class: `ASN1Object`
  Method providing a primitive representation of this object suitable for encoding.

  Specified by:
    `toASN1Primitive` in interface `ASN1Encodable`
  Specified by:
    `toASN1Primitive` in class `ASN1Object`
  Returns:
    a primitive representation of this object.

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